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21047 Hodierna (1990 SE5)
Classification: Outer Main-belt Asteroid          SPK-ID: 2021047
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .175418389422634 3.6312e-08  
a 3.982118470410618 3.4752e-08 au
q 3.283581661841065 1.547e-07 au
i 4.490634996881902 4.741e-06 deg
node 52.25382586023585 4.7738e-05 deg
peri 290.24556676651 4.9504e-05 deg
M 279.9279136570484 1.4634e-05 deg
tp 2459646.077424984785
(2022-Mar-07.57742498)
0.00012272 TDB
period 2902.483045079048
7.95
3.7996e-05
1.04e-07
d
yr
n .1240317322819006 1.6237e-09 deg/d
Q 4.680655278980172 4.0849e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1339  
   data-arc span      13796 days (37.77 yr)  
   first obs. used      1982-10-15  
   last obs. used      2020-07-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52349  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:13  

Additional Information
 Earth MOID = 2.27966 au 
 Jupiter MOID = .787992 au 
 T_jup = 3.024 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9   n/a MPO435895  
diameter diameter 16.029 km 0.544 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
geometric albedo albedo 0.052   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  

21047 Hodierna           Discovered 1990 Sept. 22 by E. W. Elst at the European Southern Observatory.
Giovanni Battista Hodierna (1597-1660) was a catholic priest who taught mathematics and astronomy in Ragusa, Sicily. An enthusiastic follower of Galileo, he observed the rings of Saturn and the eclipses of Jupiter's satellites. His best-known work was Medicaeorum Ephemerides.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040928/MPCPages.arcLast Updated: 2004-09-28

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Alternate Designations
 1990 SE5 = 1998 SS60 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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